Swollen feet are mainly related to the following diseases: First, heart failure, due to the increased resistance of peripheral blood return to the heart, blood tends to be stagnant in the sagging parts of the body, which can easily cause edema of the lower limbs and feet. Second, deep vein thrombosis of the lower extremities, especially in patients with lower extremity fractures and long-term bedridden, if the formation of lower extremity venous thrombosis, affecting the venous return will cause edema of the feet. Third, hypothyroidism, this kind of patients secretion of thyroid hormone is insufficient, easy to cause mucous edema of the lower limbs. Fourth, the blood albumin is reduced, liver insufficiency, the body’s ability to synthesize albumin is reduced, patients with nephrotic syndrome, a large amount of albumin loss from the kidneys, can appear hypoalbuminemia, causing water from the blood vessels to the outside of the blood vessels, the emergence of tissue edema, the same can be caused by swollen feet. Fifthly, if the foot is swollen unilaterally, there may be problems with the venous blood vessels, such as varicose veins, venous thrombosis or even venous valves, and it is necessary to do venous ultrasound and other examinations.